Science & Mathematics - 27 September 2007

2007-09-27 16:02:13 · 2 answers · asked by fabulous! 1 in Mathematics

2007-09-27 16:01:51 · 2 answers · asked by StLouisCardinals2006Worldseries 1 in Mathematics

What is different between element and atom?
what is the different between molecule and compound?
what is phase?
thank you for reading
if you use it with easy words, then you get the best answer but very detailed but short answer to understand

2007-09-27 16:00:34 · 1 answers · asked by Anonymous in Chemistry

Terrestrially, I look at ships that are two miles away and I want to see the flags they are flying and read the name on the prow (the stern is not always visible).

I am looking to spend a maximum of $500 including taxes. I don't need "bells and whistles" either; I just want the scope to be worth the money.

I'd rather have more scope than motorization and I want an Azimuth mount. Slow motion control would be good (ships are moving).

What I have now is a cheap 60mm f15 (a Jason 319 Mercury), with 20mm and 14mm eyepieces (1.25" with a converter diagonal). I can read the name on the prow okay, but the flags are too small to really make them out.

The 14mm eyepiece (2x marlow) gets me up to 128x, which is clear but dim in a 60mm scope (120x is probably the absolute most that I should expect).

I do like the view at 128x and for viewing the Moon and major planets etc I'm thinking of more power (up to 200x or so), though more aperture is higher priority.

Advice please? Thank you!

2007-09-27 15:59:24 · 3 answers · asked by infoseeker1972 1 in Astronomy & Space

when do you use like
Iron (III) hydroxide
what is ionic? is it non metal+ metal
and when do you use like covelent ?
is it non-metal and non metal?
can you give an example for each one?
even if i get this right or wriong, please explain ionic and covelent precisely using simplified words since im not an english native speaker thank you

2007-09-27 15:58:29 · 3 answers · asked by Anonymous in Chemistry

the taste of water

is it impossiable?.....how do you know?

2007-09-27 15:56:10 · 3 answers · asked by Anonymous in Botany

-4x-2y=-12
4x+8y=-24

2007-09-27 15:54:45 · 10 answers · asked by idalmis m 1 in Mathematics

whats the difference between an animal cell and plant cell?
i'm still lost.
how do i distinguish it?

2007-09-27 15:54:07 · 12 answers · asked by Help <3 Wanted 3 in Biology

2007-09-27 15:53:36 · 2 answers · asked by Anonymous in Biology

2007-09-27 15:51:58 · 3 answers · asked by Anonymous in Astronomy & Space

An organic compound contains C, H, N, and O. Combustion of 0.1023 g of the compound in excess oxygen yielded 0.2766 g of CO2 and 0.0991 g of H2O. A sample of 0.4831 g of of the compound was analyzed for nitrogen by the Dumas method. At STP, 27.6 mL of dry N2 was obtained. In a third experiment the density of the compound as a gas was found to be 4.02 g/L at 127°C and 256 torr. What are the empirical formula and the molecular formula of the compound? (Type your answer using the format CO2 for CO2.)

2007-09-27 15:50:55 · 1 answers · asked by Anonymous in Chemistry

My high school has majors and I'm in the Chemistry major and I want to design a T Shirt for us since it's senior year. I've already got the back side (says "CHEM ROCKS" using the periodic table boxes for each letter to pretend that all of them are elements.....) but I need something for the front.
The only one I could think of was "Lets mix fluids/liquids (don't know which one)" and have beakers and flasks mixing stuff on the front, but it might be too kinky for high school (though last year's Bio-med kids had "Let's play doctor... It's time for your physical...")
So any suggestions?

2007-09-27 15:50:27 · 4 answers · asked by meep meep 7 in Chemistry

2007-09-27 15:49:39 · 2 answers · asked by tiwn raro 2 in Biology

http://answers.yahoo.com/question/index;_ylt=AmiYRy2Dgy6M6nfomcULxrfsy6IX;_ylv=3?qid=20070927172751AAxLeBd

2007-09-27 15:48:38 · 1 answers · asked by Memories of Another World. 6 in Chemistry

2007-09-27 15:47:56 · 2 answers · asked by Vicky 1 in Earth Sciences & Geology

2007-09-27 15:47:14 · 2 answers · asked by Vicky 1 in Earth Sciences & Geology

An inventive child wants to reach an apple in a tree without climbing the tree. Sitting in a chair connected to a rope that passes over a frictionless pulley (Fig. P4.79), the child pulls on the loose end of the rope with such a force that the spring scale reads 320 N. The child's true weight is 260 N, and the chair weighs 160 N.
Find the force the child exerts on the seat of the chair.

I know that the acceleration is 5.13 m/s^2 but how do I find the force the child exerts on the seat?? Thanks !

2007-09-27 15:47:04 · 1 answers · asked by me 1 in Physics

2007-09-27 15:46:34 · 4 answers · asked by Vicky 1 in Earth Sciences & Geology

Which fatty acids are solid at room temperature? Which ones are liquid? PLease help!

2007-09-27 15:45:46 · 2 answers · asked by leah 1 in Chemistry

2007-09-27 15:44:38 · 7 answers · asked by Rajchem 2 in Mathematics

2007-09-27 15:44:25 · 2 answers · asked by Tajuice 2 in Biology

2007-09-27 15:43:25 · 1 answers · asked by Anonymous in Astronomy & Space

when finding a melting point, why is it necessary to raise the temperature very slowly when approaching the meltng temperature?

2007-09-27 15:42:54 · 2 answers · asked by Anonymous in Chemistry

2007-09-27 15:42:42 · 2 answers · asked by CarolAnne K 2 in Earth Sciences & Geology

Whats the difference between a hydrolysis reaction and a synthesis reaction? PLease help!

2007-09-27 15:41:32 · 2 answers · asked by linda 2 in Chemistry

If anyone has been to Hawaii (Maui in particular) you'll notice the sky at night to almost glow. No matter how full the moon is, or if the moon is even visible from being covered by small clouds, the Hawaiian night sky gleams so nicely. The clouds almost appear to have a shine around them. Does anyone know why that is? Does it have anything to do with being closer to the equator?

2007-09-27 15:41:24 · 4 answers · asked by :blueberry: 1 in Astronomy & Space

2007-09-27 15:39:36 · 3 answers · asked by Anonymous in Chemistry

2007-09-27 15:38:00 · 5 answers · asked by Anonymous in Biology

(other than glucose monomers)

2007-09-27 15:36:37 · 3 answers · asked by Moose 4 in Biology

We have a review page for chemistry and it's got conversion problems on it, like 0.75kg to milligrams. I know how to do them by simply moving the decimal, but I checked my first answer and I think we have to do it mathematically. If I do it by just moving the decimal, don't I still get the same answer?? I am SO confused!!
......Ok. for 0.75 kilograms to milligrams, I moved the decimal to make it correct (I think). I have .00000075 but the answer says it should be 7.5x10^5 which means moving the decimal the OTHER way, I thought! So that would be 750,000. But it just doesn't make any sense!

Here's what she wrote:
.75kg x (10^6mg/1kg) = mg

Obviously, chemistry isn't one of my strengths...
If you can help, I would really appreciate it!!! :( I have a test tomorrow and I really don't want to fail.

Thanks.

2007-09-27 15:35:52 · 2 answers · asked by ? 2 in Chemistry